Well, just in direct response to the original post-
If you do want to instruct on a PPL you need to have the CPL/ATPL exams done before you can start the FI course and have a certain amount of hours (which I cannot think of off the top of my head, but I believe it's something like you need 150 hours p1?!?). But without the CPL, you cannot get paid.
To be perfectly frank, if I started instructing after my PPL, it would have been a disaster!! (Bad enough now!!haha) The experience built from PPL-CPL and beyond is invaluable and just think of it this way-the person you want teaching you is someone who is the voice of experience to some degree and an inexperienced PPLer, in my opinion, does not fit the bill.